Injector



' Oct. 30, 1923.

R. D. METCALFE ET AL INJECTOR Filed July 22, 1922 5 Sheets-Sheet 2 Patented @et 30, 1923.

NED

. lAlZliif RICHARD DAVID METCALFE AND JAMES CROXON METCALFE, OF ROMILEY, ENGLAND.

Application led July 22,

To all whom it may concern:

Be it known that we, RICHARD Devin Mn'r- -oALrn and JAMES CRoxoN Mnrciinrn, both of Romiley, in the county of Chester, England, subjects of the King of Great Britain and Ireland, have invented Vcertain new and useiul Improvements in injectors, of which the 'following is a specification.

This invention relates to injectors worked by exhaust steam or steam at about atmosplieric pressure.

In the specification of prior U. S. Patent No. 1,342,128 we have described an exhaust injector in which there is combined with a l5 main exhaust steam nozzle, a water cone or preliminary mixing nozzle, into the inlet end of which water issues with the exhaust steam from the main nozzle and'around the delivery end of which a supplementary exhaust steamv jet issues, there being a further preliminary mixing nozzle between the water cone and the combining nozzle, the gap between the latter two nozzles communicating with a closed chamber or compartment in which a high degree oi vacui'im is created and maintained by the jet travelling into the combining nozzle.

The present invention relates to exhaust injectors constructed with the combination of partsbefore referred to and has Afor its object to provide an improved construction and arrangement of the combining nozzle and the further preliminary mixingrnozzle with, if desired, the water cone which enables a very high degree or accuracy in the alignment ot the different nozzles to be obtained in an expeditious manner.

The invention comprises the improved construction and combination otl parts hereiuaiter described and claimed.

Referring to the three accompanying sheets of explanatory drawings TFigure l is a sectional elevation and FigureV 2 a plan view, partly in section, of an exhaust injector constructed in accordance with our invention.

Figures 3 and 4- are views similar to Figures l and 2 but showing only a portion of an exhaust injector constructedin a modi lied form in accordance with our invention.

The saine reference letters in the different views indicate the same or similar parts.

The injector comprises a delivery nozzle a, a combining nozzle with an opening 1922. Serial ll'o. 576,813.

and closing flap c thereon, a water cone Z with a mixing nozzle e between the said cone Z and the combining nozzle Z9, a. main exhaust steam inlet nozzle g, a live steam inlet nozzle 7L and a space z' around the said nozzle 7i, through which live steam throt` tled down to about atn'iospheric pressure is admitted to the injector when the normal supply of exhaust steam is not available. A valve j controls the passage for the flow of the exhaust steam into the injector. Steam passes to the delivery end oit the water cone al by way oi. the passage (Z1, see Figure 2.

ln accordance with our present invention, the vacuum chamber 7c communicating with the gap between the preliminary mixing nozzle e and the combining nozzle b is provided within the end ot the latter nozzle by forming an extension m thereon into which the said nozzle e threads as shown. lTVith this construction, the coring and machining oi.' the injector body is consider` ably simplified.

In the construction shown in Figures 3 and ll, the extension m upon the combining nozzle Z) is adapted to receive both the Water cone d and the preliminary mixing nozzle e, slots or gaps p being provided in the extension m to allow steam to pass from dI to the delivery end oi' the water cone d. It will be seen that with this construction, the fitting of the combining nozzle into position, also positions correctly the water cone and preliminary mixing nozzle.

We claim l. An improved exhaust steam injector comprising, in combination, a casing, a main exhaust steam nozzle, a wat-er cone into which water issues with the exhaust steam from the main nozzle and around the delivery end ot which a supplementary exhaust steam jet issues, a combining nozzle, a delivery nozzle, a preliminary mixing nozzle. secured in an extension of the combining nozzle, all ot said nozzles and said cone being arranged in the casing, and said preliminary mixing nozzle being removable as a unit- 'rom the casing with said combining nozzle.. and a closed compartment communieating with the gap between the said preliminary mixing nozzle and combining nozzle, said compartment being formed in the extension of the latter nozzle, a high depreliminary mixing nozzle and combining nozzle iii-which a high degree of vacuum is created by the jet passing into the combining nozzle, and a Water cone also secured in said extension of the combining nozzle, with a gap between itself and the preliminary mixing nozzle, the extension being slotted Vto give communi -ation to-said gap from the exhaust steam inlet of the injector, as Set forth.

An injector as claimed in claim in which the Water cone is connected to'tlie extension of the combining nozzle and is removable from thecasing as a unit with said combining nozzle.

4. VAn improved exhaust steam injector in cludnig a cas-ing, a delivery nozzle arranged at the forward end of said casingV and removable from the casing through one end of the casing, a combining nozzle larranged in the casing. and connected to the deliverynozzle for removal as a unit With said delivery nozzle, a tubular extension provided on the rear endof said combining nozzle, Y

a mixing nozzle detachably connected to said extension and removable with the comn bining nozzle as aV unit from the casing, a

water cone in the casing extendinginto the l mixing nozzle, an exhaust steam nozzle in the casing arranged rearwardly of the Wa` ter cone, and a chamber in the casing from Which exhaust steam is delivered to said ex-V haust steam nozzle. Y. Y

5. An inyector Vas claimed in claim 4 including a by-pass for ,by-passingk exhaustL steam from said Chamber around the ex` liaust steam nozzle and into said Water cone, said Water cone being provided with apertures to permit the by-passed steam to enter said Water cone.

In testimony whereof We have signed our names to this specification.

RCHARD DAVID METCA'LFE JAMES CROXON METCALFE. 

